1 -- The theme is what decides what's actually shown on screen, what kind of
2 -- transitions are available (if any), and what kind of inputs there are,
3 -- if any. In general, it drives the entire display logic by creating Movit
4 -- chains, setting their parameters and then deciding which to show when.
6 -- Themes are written in Lua, which reflects a simplified form of the Movit API
7 -- where all the low-level details (such as texture formats) are handled by the
8 -- C++ side and you generally just build chains.
10 local transition_start = -2.0
11 local transition_end = -1.0
14 local zoom_poi = 0 -- which input to zoom in on
15 local fade_src_signal = 0
16 local fade_dst_signal = 0
18 local input0_neutral_color = {0.5, 0.5, 0.5}
19 local input1_neutral_color = {0.5, 0.5, 0.5}
21 local live_signal_num = 0
22 local preview_signal_num = 1
24 -- Valid values for live_signal_num and preview_signal_num.
25 local INPUT0_SIGNAL_NUM = 0
26 local INPUT1_SIGNAL_NUM = 1
27 local SBS_SIGNAL_NUM = 2
28 local STATIC_SIGNAL_NUM = 3
30 -- “fake” signal number that signifies that we are fading from one input
32 local FADE_SIGNAL_NUM = 4
34 -- Last width/height/frame rate for each channel, if we have it.
35 -- Note that unlike the values we get from Nageru, the resolution is per
36 -- frame and not per field, since we deinterlace.
37 local last_resolution = {}
39 -- Utility function to help creating many similar chains that can differ
40 -- in a free set of chosen parameters.
41 function make_cartesian_product(parms, callback)
42 return make_cartesian_product_internal(parms, callback, 1, {})
45 function make_cartesian_product_internal(parms, callback, index, args)
46 if index > #parms then
47 return callback(unpack(args))
50 for _, value in ipairs(parms[index]) do
52 ret[value] = make_cartesian_product_internal(parms, callback, index + 1, args)
57 function make_sbs_input(chain, signal, deint, hq)
58 local input = chain:add_live_input(not deint, deint) -- Override bounce only if not deinterlacing.
59 input:connect_signal(signal)
60 local wb_effect = chain:add_effect(WhiteBalanceEffect.new())
62 local resample_effect = nil
63 local resize_effect = nil
65 resample_effect = chain:add_effect(ResampleEffect.new())
67 resize_effect = chain:add_effect(ResizeEffect.new())
70 local padding_effect = chain:add_effect(IntegralPaddingEffect.new())
74 wb_effect = wb_effect,
75 resample_effect = resample_effect,
76 resize_effect = resize_effect,
77 padding_effect = padding_effect
81 -- The main live chain.
82 function make_sbs_chain(input0_deint, input1_deint, hq)
83 local chain = EffectChain.new(16, 9)
85 local input0 = make_sbs_input(chain, INPUT0_SIGNAL_NUM, input0_deint, hq)
86 local input1 = make_sbs_input(chain, INPUT1_SIGNAL_NUM, input1_deint, hq)
88 input0.padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 1.0)
89 input1.padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 0.0)
91 chain:add_effect(OverlayEffect.new(), input0.padding_effect, input1.padding_effect)
101 -- Make all possible combinations of side-by-side chains.
102 local sbs_chains = make_cartesian_product({
103 {"live", "livedeint"}, -- input0_type
104 {"live", "livedeint"}, -- input1_type
106 }, function(input0_type, input1_type, hq)
107 local input0_deint = (input0_type == "livedeint")
108 local input1_deint = (input1_type == "livedeint")
109 return make_sbs_chain(input0_deint, input1_deint, hq)
112 function make_fade_input(chain, signal, live, deint, scale)
113 local input, wb_effect, resample_effect, last
115 input = chain:add_live_input(false, deint)
116 wb_effect = chain:add_effect(WhiteBalanceEffect.new())
117 input:connect_signal(signal)
120 input = chain:add_effect(ImageInput.new("bg.jpeg"))
124 -- If we cared about this for the non-main inputs, we would have
125 -- checked hq here and invoked ResizeEffect instead.
127 resample_effect = chain:add_effect(ResampleEffect.new())
128 last = resample_effect
133 wb_effect = wb_effect,
134 resample_effect = resample_effect,
139 -- A chain to fade between two inputs, of which either can be a picture
140 -- or a live input. In practice only used live, but we still support the
142 function make_fade_chain(input0_live, input0_deint, input0_scale, input1_live, input1_deint, input1_scale, hq)
143 local chain = EffectChain.new(16, 9)
145 local input0 = make_fade_input(chain, INPUT0_SIGNAL_NUM, input0_live, input0_deint, input0_scale)
146 local input1 = make_fade_input(chain, INPUT1_SIGNAL_NUM, input1_live, input1_deint, input1_scale)
148 local mix_effect = chain:add_effect(MixEffect.new(), input0.last, input1.last)
155 mix_effect = mix_effect
159 -- Chains to fade between two inputs, in various configurations.
160 local fade_chains = make_cartesian_product({
161 {"static", "live", "livedeint"}, -- input0_type
162 {true, false}, -- input0_scale
163 {"static", "live", "livedeint"}, -- input1_type
164 {true, false}, -- input1_scale
166 }, function(input0_type, input0_scale, input1_type, input1_scale, hq)
167 local input0_live = (input0_type ~= "static")
168 local input1_live = (input1_type ~= "static")
169 local input0_deint = (input0_type == "livedeint")
170 local input1_deint = (input1_type == "livedeint")
171 return make_fade_chain(input0_live, input0_deint, input0_scale, input1_live, input1_deint, input1_scale, hq)
174 -- A chain to show a single input on screen.
175 function make_simple_chain(input_deint, input_scale, hq)
176 local chain = EffectChain.new(16, 9)
178 local input = chain:add_live_input(false, input_deint)
179 input:connect_signal(0) -- First input card. Can be changed whenever you want.
180 local wb_effect = chain:add_effect(WhiteBalanceEffect.new())
183 local resample_effect, resize_effect
186 resample_effect = chain:add_effect(ResampleEffect.new())
188 resize_effect = chain:add_effect(ResizeEffect.new())
195 wb_effect = wb_effect,
196 resample_effect = resample_effect,
197 resize_effect = resize_effect
201 -- Make all possible combinations of single-input chains.
202 local simple_chains = make_cartesian_product({
203 {"live", "livedeint"}, -- input_type
204 {true, false}, -- input_scale
206 }, function(input_type, input_scale, hq)
207 local input_deint = (input_type == "livedeint")
208 return make_simple_chain(input_deint, input_scale, hq)
211 -- A chain to show a single static picture on screen (HQ version).
212 local static_chain_hq = EffectChain.new(16, 9)
213 local static_chain_hq_input = static_chain_hq:add_effect(ImageInput.new("bg.jpeg"))
214 static_chain_hq:finalize(true)
216 -- A chain to show a single static picture on screen (LQ version).
217 local static_chain_lq = EffectChain.new(16, 9)
218 local static_chain_lq_input = static_chain_lq:add_effect(ImageInput.new("bg.jpeg"))
219 static_chain_lq:finalize(false)
221 -- Used for indexing into the tables of chains.
222 function get_input_type(signals, signal_num)
223 if signal_num == STATIC_SIGNAL_NUM then
225 elseif signals:get_interlaced(signal_num) then
232 function needs_scale(signals, signal_num, width, height)
233 if signal_num == STATIC_SIGNAL_NUM then
234 -- We assume this is already correctly scaled at load time.
237 assert(signal_num == INPUT0_SIGNAL_NUM or signal_num == INPUT1_SIGNAL_NUM)
238 return (signals:get_width(signal_num) ~= width or signals:get_height(signal_num) ~= height)
241 function set_scale_parameters_if_needed(chain_or_input, width, height)
242 if chain_or_input.resample_effect then
243 chain_or_input.resample_effect:set_int("width", width)
244 chain_or_input.resample_effect:set_int("height", height)
245 elseif chain_or_input.resize_effect then
246 chain_or_input.resize_effect:set_int("width", width)
247 chain_or_input.resize_effect:set_int("height", height)
252 -- Returns the number of outputs in addition to the live (0) and preview (1).
253 -- Called only once, at the start of the program.
254 function num_channels()
258 -- Helper function to write e.g. “60” or “59.94”.
259 function get_frame_rate(signal_num)
260 local nom = last_resolution[signal_num].frame_rate_nom
261 local den = last_resolution[signal_num].frame_rate_den
262 if nom % den == 0 then
265 return string.format("%.2f", nom / den)
269 -- Helper function to write e.g. “720p60”.
270 function get_channel_resolution(signal_num)
271 if last_resolution[signal_num] then
272 if not last_resolution[signal_num].has_signal then
274 elseif last_resolution[signal_num].interlaced then
275 return last_resolution[signal_num].height .. "i" .. get_frame_rate(signal_num)
277 return last_resolution[signal_num].height .. "p" .. get_frame_rate(signal_num)
285 -- Returns the name for each additional channel (starting from 2).
286 -- Called at the start of the program, and then each frame for live
287 -- channels in case they change resolution.
288 function channel_name(channel)
290 return "Input 1 (" .. get_channel_resolution(0) .. ")"
291 elseif channel == 3 then
292 return "Input 2 (" .. get_channel_resolution(1) .. ")"
293 elseif channel == 4 then
294 return "Side-by-side"
295 elseif channel == 5 then
296 return "Static picture"
301 -- Returns, given a channel number, which signal it corresponds to (starting from 0).
302 -- Should return -1 if the channel does not correspond to a simple signal.
303 -- Called once for each channel, at the start of the program.
304 -- Will never be called for live (0) or preview (1).
305 function channel_signal(channel)
308 elseif channel == 3 then
316 -- Returns if a given channel supports setting white balance (starting from 2).
317 -- Called only once for each channel, at the start of the program.
318 function supports_set_wb(channel)
319 return channel == 2 or channel == 3
323 -- Gets called with a new gray point when the white balance is changing.
324 -- The color is in linear light (not sRGB gamma).
325 function set_wb(channel, red, green, blue)
327 input0_neutral_color = { red, green, blue }
328 elseif channel == 3 then
329 input1_neutral_color = { red, green, blue }
333 function finish_transitions(t)
334 -- If live is SBS but de-facto single, make it so.
335 if live_signal_num == SBS_SIGNAL_NUM and t >= transition_end and zoom_dst == 1.0 then
336 live_signal_num = zoom_poi
339 -- If live is fade but de-facto single, make it so.
340 if live_signal_num == FADE_SIGNAL_NUM and t >= transition_end then
341 live_signal_num = fade_dst_signal
346 -- Called every frame.
347 function get_transitions(t)
348 finish_transitions(t)
350 if live_signal_num == preview_signal_num then
354 if live_signal_num == SBS_SIGNAL_NUM and t >= transition_start and t <= transition_end then
359 if (live_signal_num == INPUT0_SIGNAL_NUM or
360 live_signal_num == INPUT1_SIGNAL_NUM or
361 live_signal_num == STATIC_SIGNAL_NUM) and
362 (preview_signal_num == INPUT0_SIGNAL_NUM or
363 preview_signal_num == INPUT1_SIGNAL_NUM or
364 preview_signal_num == STATIC_SIGNAL_NUM) then
365 return {"Cut", "", "Fade"}
369 if live_signal_num == SBS_SIGNAL_NUM and
370 (preview_signal_num == INPUT0_SIGNAL_NUM or preview_signal_num == INPUT1_SIGNAL_NUM) then
371 return {"Cut", "Zoom in"}
372 elseif (live_signal_num == INPUT0_SIGNAL_NUM or live_signal_num == INPUT1_SIGNAL_NUM) and
373 preview_signal_num == SBS_SIGNAL_NUM then
374 return {"Cut", "Zoom out"}
380 function transition_clicked(num, t)
383 if live_signal_num == FADE_SIGNAL_NUM then
384 -- Ongoing fade; finish it immediately.
385 finish_transitions(transition_end)
388 local temp = live_signal_num
389 live_signal_num = preview_signal_num
390 preview_signal_num = temp
392 if live_signal_num == SBS_SIGNAL_NUM then
393 -- Just cut to SBS, we need to reset any zooms.
396 transition_start = -2.0
397 transition_end = -1.0
402 finish_transitions(t)
404 if live_signal_num == preview_signal_num then
409 if (live_signal_num == INPUT0_SIGNAL_NUM and preview_signal_num == INPUT1_SIGNAL_NUM) or
410 (live_signal_num == INPUT1_SIGNAL_NUM and preview_signal_num == INPUT0_SIGNAL_NUM) then
411 -- We can't zoom between these. Just make a cut.
412 io.write("Cutting from " .. live_signal_num .. " to " .. live_signal_num .. "\n")
413 local temp = live_signal_num
414 live_signal_num = preview_signal_num
415 preview_signal_num = temp
419 if live_signal_num == SBS_SIGNAL_NUM and
420 (preview_signal_num == INPUT0_SIGNAL_NUM or preview_signal_num == INPUT1_SIGNAL_NUM) then
421 -- Zoom in from SBS to single.
423 transition_end = t + 1.0
426 zoom_poi = preview_signal_num
427 preview_signal_num = SBS_SIGNAL_NUM
428 elseif (live_signal_num == INPUT0_SIGNAL_NUM or live_signal_num == INPUT1_SIGNAL_NUM) and
429 preview_signal_num == SBS_SIGNAL_NUM then
430 -- Zoom out from single to SBS.
432 transition_end = t + 1.0
435 preview_signal_num = live_signal_num
436 zoom_poi = live_signal_num
437 live_signal_num = SBS_SIGNAL_NUM
440 finish_transitions(t)
443 if (live_signal_num ~= preview_signal_num) and
444 (live_signal_num == INPUT0_SIGNAL_NUM or
445 live_signal_num == INPUT1_SIGNAL_NUM or
446 live_signal_num == STATIC_SIGNAL_NUM) and
447 (preview_signal_num == INPUT0_SIGNAL_NUM or
448 preview_signal_num == INPUT1_SIGNAL_NUM or
449 preview_signal_num == STATIC_SIGNAL_NUM) then
451 transition_end = t + 1.0
452 fade_src_signal = live_signal_num
453 fade_dst_signal = preview_signal_num
454 preview_signal_num = live_signal_num
455 live_signal_num = FADE_SIGNAL_NUM
457 -- Fades involving SBS are ignored (we have no chain for it).
463 function channel_clicked(num)
464 preview_signal_num = num
468 -- Called every frame. Get the chain for displaying at input <num>,
469 -- where 0 is live, 1 is preview, 2 is the first channel to display
470 -- in the bottom bar, and so on up to num_channels()+1. t is the
471 -- current time in seconds. width and height are the dimensions of
472 -- the output, although you can ignore them if you don't need them
473 -- (they're useful if you want to e.g. know what to resample by).
475 -- <signals> is basically an exposed InputState, which you can use to
476 -- query for information about the signals at the point of the current
477 -- frame. In particular, you can call get_width() and get_height()
478 -- for any signal number, and use that to e.g. assist in chain selection.
480 -- You should return two objects; the chain itself, and then a
481 -- function (taking no parameters) that is run just before rendering.
482 -- The function needs to call connect_signal on any inputs, so that
483 -- it gets updated video data for the given frame. (You are allowed
484 -- to switch which input your input is getting from between frames,
485 -- but not calling connect_signal results in undefined behavior.)
486 -- If you want to change any parameters in the chain, this is also
489 -- NOTE: The chain returned must be finalized with the Y'CbCr flag
490 -- if and only if num==0.
491 function get_chain(num, t, width, height, signals)
492 local input_resolution = {}
493 for signal_num=0,1 do
495 width = signals:get_width(signal_num),
496 height = signals:get_height(signal_num),
497 interlaced = signals:get_interlaced(signal_num),
498 has_signal = signals:get_has_signal(signal_num),
499 frame_rate_nom = signals:get_frame_rate_nom(signal_num),
500 frame_rate_den = signals:get_frame_rate_den(signal_num)
503 if res.interlaced then
504 -- Convert height from frame height to field height.
505 -- (Needed for e.g. place_rectangle.)
506 res.height = res.height * 2
508 -- Show field rate instead of frame rate; really for cosmetics only
509 -- (and actually contrary to EBU recommendations, although in line
510 -- with typical user expectations).
511 res.frame_rate_nom = res.frame_rate_nom * 2
514 input_resolution[signal_num] = res
516 last_resolution = input_resolution
518 if num == 0 then -- Live.
519 if live_signal_num == INPUT0_SIGNAL_NUM or live_signal_num == INPUT1_SIGNAL_NUM then -- Plain input.
520 local input_type = get_input_type(signals, live_signal_num)
521 local input_scale = needs_scale(signals, live_signal_num, width, height)
522 local chain = simple_chains[input_type][input_scale][true]
524 chain.input:connect_signal(live_signal_num)
525 set_scale_parameters_if_needed(chain, width, height)
526 set_neutral_color_from_signal(chain.wb_effect, live_signal_num)
528 return chain.chain, prepare
529 elseif live_signal_num == STATIC_SIGNAL_NUM then -- Static picture.
532 return static_chain_hq, prepare
533 elseif live_signal_num == FADE_SIGNAL_NUM then -- Fade.
534 local input0_type = get_input_type(signals, fade_src_signal)
535 local input0_scale = needs_scale(signals, fade_src_signal, width, height)
536 local input1_type = get_input_type(signals, fade_dst_signal)
537 local input1_scale = needs_scale(signals, fade_dst_signal, width, height)
538 local chain = fade_chains[input0_type][input0_scale][input1_type][input1_scale][true]
540 if input0_type == "live" or input0_type == "livedeint" then
541 chain.input0.input:connect_signal(fade_src_signal)
542 set_neutral_color_from_signal(chain.input0.wb_effect, fade_src_signal)
544 set_scale_parameters_if_needed(chain.input0, width, height)
545 if input1_type == "live" or input1_type == "livedeint" then
546 chain.input1.input:connect_signal(fade_dst_signal)
547 set_neutral_color_from_signal(chain.input1.wb_effect, fade_dst_signal)
549 set_scale_parameters_if_needed(chain.input1, width, height)
550 local tt = calc_fade_progress(t, transition_start, transition_end)
552 chain.mix_effect:set_float("strength_first", 1.0 - tt)
553 chain.mix_effect:set_float("strength_second", tt)
555 return chain.chain, prepare
558 -- SBS code (live_signal_num == SBS_SIGNAL_NUM).
559 local input0_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
560 local input1_type = get_input_type(signals, INPUT1_SIGNAL_NUM)
561 if t > transition_end and zoom_dst == 1.0 then
562 -- Special case: Show only the single image on screen.
563 local input0_scale = needs_scale(signals, fade_src_signal, width, height)
564 local chain = simple_chains[input0_type][input0_scale][true]
566 chain.input:connect_signal(INPUT0_SIGNAL_NUM)
567 set_scale_parameters_if_needed(chain, width, height)
568 set_neutral_color(chain.wb_effect, input0_neutral_color)
570 return chain.chain, prepare
572 local chain = sbs_chains[input0_type][input1_type][true]
574 if t < transition_start then
575 prepare_sbs_chain(chain, zoom_src, width, height, input_resolution)
576 elseif t > transition_end then
577 prepare_sbs_chain(chain, zoom_dst, width, height, input_resolution)
579 local tt = (t - transition_start) / (transition_end - transition_start)
581 tt = math.sin(tt * 3.14159265358 * 0.5)
582 prepare_sbs_chain(chain, zoom_src + (zoom_dst - zoom_src) * tt, width, height, input_resolution)
585 return chain.chain, prepare
587 if num == 1 then -- Preview.
588 num = preview_signal_num + 2
591 -- Individual preview inputs.
592 if num == INPUT0_SIGNAL_NUM + 2 then
593 local input_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
594 local input_scale = needs_scale(signals, INPUT0_SIGNAL_NUM, width, height)
595 local chain = simple_chains[input_type][input_scale][false]
597 chain.input:connect_signal(INPUT0_SIGNAL_NUM)
598 set_scale_parameters_if_needed(chain, width, height)
599 set_neutral_color(chain.wb_effect, input0_neutral_color)
601 return chain.chain, prepare
603 if num == INPUT1_SIGNAL_NUM + 2 then
604 local input_type = get_input_type(signals, INPUT1_SIGNAL_NUM)
605 local input_scale = needs_scale(signals, INPUT1_SIGNAL_NUM, width, height)
606 local chain = simple_chains[input_type][input_scale][false]
608 chain.input:connect_signal(INPUT1_SIGNAL_NUM)
609 set_scale_parameters_if_needed(chain, width, height)
610 set_neutral_color(chain.wb_effect, input1_neutral_color)
612 return chain.chain, prepare
614 if num == SBS_SIGNAL_NUM + 2 then
615 local input0_type = get_input_type(signals, INPUT0_SIGNAL_NUM)
616 local input1_type = get_input_type(signals, INPUT1_SIGNAL_NUM)
617 local chain = sbs_chains[input0_type][input1_type][false]
619 prepare_sbs_chain(chain, 0.0, width, height, input_resolution)
621 return chain.chain, prepare
623 if num == STATIC_SIGNAL_NUM + 2 then
626 return static_chain_lq, prepare
630 function place_rectangle(resample_effect, resize_effect, padding_effect, x0, y0, x1, y1, screen_width, screen_height, input_width, input_height)
637 if x0 > screen_width or x1 < 0.0 or y0 > screen_height or y1 < 0.0 then
638 resample_effect:set_int("width", 1)
639 resample_effect:set_int("height", 1)
640 resample_effect:set_float("zoom_x", screen_width)
641 resample_effect:set_float("zoom_y", screen_height)
642 padding_effect:set_int("left", screen_width + 100)
643 padding_effect:set_int("top", screen_height + 100)
649 srcx0 = -x0 / (x1 - x0)
653 srcy0 = -y0 / (y1 - y0)
656 if x1 > screen_width then
657 srcx1 = (screen_width - x0) / (x1 - x0)
660 if y1 > screen_height then
661 srcy1 = (screen_height - y0) / (y1 - y0)
665 if resample_effect ~= nil then
666 -- High-quality resampling.
667 local x_subpixel_offset = x0 - math.floor(x0)
668 local y_subpixel_offset = y0 - math.floor(y0)
670 -- Resampling must be to an integral number of pixels. Round up,
671 -- and then add an extra pixel so we have some leeway for the border.
672 local width = math.ceil(x1 - x0) + 1
673 local height = math.ceil(y1 - y0) + 1
674 resample_effect:set_int("width", width)
675 resample_effect:set_int("height", height)
677 -- Correct the discrepancy with zoom. (This will leave a small
678 -- excess edge of pixels and subpixels, which we'll correct for soon.)
679 local zoom_x = (x1 - x0) / (width * (srcx1 - srcx0))
680 local zoom_y = (y1 - y0) / (height * (srcy1 - srcy0))
681 resample_effect:set_float("zoom_x", zoom_x)
682 resample_effect:set_float("zoom_y", zoom_y)
683 resample_effect:set_float("zoom_center_x", 0.0)
684 resample_effect:set_float("zoom_center_y", 0.0)
686 -- Padding must also be to a whole-pixel offset.
687 padding_effect:set_int("left", math.floor(x0))
688 padding_effect:set_int("top", math.floor(y0))
690 -- Correct _that_ discrepancy by subpixel offset in the resampling.
691 resample_effect:set_float("left", srcx0 * input_width - x_subpixel_offset / zoom_x)
692 resample_effect:set_float("top", srcy0 * input_height - y_subpixel_offset / zoom_y)
694 -- Finally, adjust the border so it is exactly where we want it.
695 padding_effect:set_float("border_offset_left", x_subpixel_offset)
696 padding_effect:set_float("border_offset_right", x1 - (math.floor(x0) + width))
697 padding_effect:set_float("border_offset_top", y_subpixel_offset)
698 padding_effect:set_float("border_offset_bottom", y1 - (math.floor(y0) + height))
700 -- Lower-quality simple resizing.
701 local width = round(x1 - x0)
702 local height = round(y1 - y0)
703 resize_effect:set_int("width", width)
704 resize_effect:set_int("height", height)
706 -- Padding must also be to a whole-pixel offset.
707 padding_effect:set_int("left", math.floor(x0))
708 padding_effect:set_int("top", math.floor(y0))
712 -- This is broken, of course (even for positive numbers), but Lua doesn't give us access to real rounding.
714 return math.floor(x + 0.5)
717 function lerp(a, b, t)
718 return a + (b - a) * t
721 function prepare_sbs_chain(chain, t, screen_width, screen_height, input_resolution)
722 chain.input0.input:connect_signal(0)
723 chain.input1.input:connect_signal(1)
724 set_neutral_color(chain.input0.wb_effect, input0_neutral_color)
725 set_neutral_color(chain.input1.wb_effect, input1_neutral_color)
727 -- First input is positioned (16,48) from top-left.
728 local width0 = round(848 * screen_width/1280.0)
729 local height0 = round(width0 * 9.0 / 16.0)
731 local top0 = 48 * screen_height/720.0
732 local left0 = 16 * screen_width/1280.0
733 local bottom0 = top0 + height0
734 local right0 = left0 + width0
736 -- Second input is positioned (16,48) from the bottom-right.
737 local width1 = round(384 * screen_width/1280.0)
738 local height1 = round(216 * screen_height/720.0)
740 local bottom1 = screen_height - 48 * screen_height/720.0
741 local right1 = screen_width - 16 * screen_width/1280.0
742 local top1 = bottom1 - height1
743 local left1 = right1 - width1
745 -- Interpolate between the fullscreen and side-by-side views.
746 local scale0, tx0, tx0
747 if zoom_poi == INPUT0_SIGNAL_NUM then
748 local new_left0 = lerp(left0, 0, t)
749 local new_right0 = lerp(right0, screen_width, t)
750 local new_top0 = lerp(top0, 0, t)
751 local new_bottom0 = lerp(bottom0, screen_height, t)
753 scale0 = (new_right0 - new_left0) / width0 -- Same vertically and horizonally.
754 tx0 = new_left0 - left0 * scale0
755 ty0 = new_top0 - top0 * scale0
757 local new_left1 = lerp(left1, 0, t)
758 local new_right1 = lerp(right1, screen_width, t)
759 local new_top1 = lerp(top1, 0, t)
760 local new_bottom1 = lerp(bottom1, screen_height, t)
762 scale0 = (new_right1 - new_left1) / width1 -- Same vertically and horizonally.
763 tx0 = new_left1 - left1 * scale0
764 ty0 = new_top1 - top1 * scale0
767 top0 = top0 * scale0 + ty0
768 bottom0 = bottom0 * scale0 + ty0
769 left0 = left0 * scale0 + tx0
770 right0 = right0 * scale0 + tx0
772 top1 = top1 * scale0 + ty0
773 bottom1 = bottom1 * scale0 + ty0
774 left1 = left1 * scale0 + tx0
775 right1 = right1 * scale0 + tx0
776 place_rectangle(chain.input0.resample_effect, chain.input0.resize_effect, chain.input0.padding_effect, left0, top0, right0, bottom0, screen_width, screen_height, input_resolution[0].width, input_resolution[0].height)
777 place_rectangle(chain.input1.resample_effect, chain.input1.resize_effect, chain.input1.padding_effect, left1, top1, right1, bottom1, screen_width, screen_height, input_resolution[1].width, input_resolution[1].height)
780 function set_neutral_color(effect, color)
781 effect:set_vec3("neutral_color", color[1], color[2], color[3])
784 function set_neutral_color_from_signal(effect, signal)
785 if signal == INPUT0_SIGNAL_NUM then
786 set_neutral_color(effect, input0_neutral_color)
788 set_neutral_color(effect, input1_neutral_color)
792 function calc_fade_progress(t, transition_start, transition_end)
793 local tt = (t - transition_start) / (transition_end - transition_start)
800 -- Make the fade look maybe a tad more natural, by pumping it
801 -- through a sigmoid function.
803 tt = 1.0 / (1.0 + math.exp(-tt))